[PATCH v6 03/18] mm: Introduce pte_advance_pfn() and use for pte_next_pfn()

[Ryan Roberts]

The goal is to be able to advance a PTE by an arbitrary number of PFNs.
So introduce a new API that takes a nr param. Define the default
implementation here and allow for architectures to override.
pte_next_pfn() becomes a wrapper around pte_advance_pfn().

Follow up commits will convert each overriding architecture's
pte_next_pfn() to pte_advance_pfn().

Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx>
---
 include/linux/pgtable.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index 231370e1b80f..b7ac8358f2aa 100644
--- a/include/linux/pgtable.h
+++ b/include/linux/pgtable.h
@@ -212,14 +212,17 @@ static inline int pmd_dirty(pmd_t pmd)
 #define arch_flush_lazy_mmu_mode()	do {} while (0)
 #endif
 
-
 #ifndef pte_next_pfn
-static inline pte_t pte_next_pfn(pte_t pte)
+#ifndef pte_advance_pfn
+static inline pte_t pte_advance_pfn(pte_t pte, unsigned long nr)
 {
-	return __pte(pte_val(pte) + (1UL << PFN_PTE_SHIFT));
+	return __pte(pte_val(pte) + (nr << PFN_PTE_SHIFT));
 }
 #endif
 
+#define pte_next_pfn(pte) pte_advance_pfn(pte, 1)
+#endif
+
 #ifndef set_ptes
 /**
  * set_ptes - Map consecutive pages to a contiguous range of addresses.
-- 
2.25.1